Wireless telegraphy.



R. A. FBSSENDEN.

WIRELESS TBLEGRAPHY.

APPLICATION FILED PEB.18, 1909 1,1 32,569. Patented Mar.23,1915.

3 SHEETS*SHEET L WITNESSES: 11v VENTORI w BY 667 4V ATTORNEY.

R. A. PESSENDEN.

WIRELESS TELBGRAPHY.

APPLICATION FILED FEB.18, 1909.

1,1 32,569. Patented Mar. 23, 1915.

3 SHEETS- 3113111 2.

WITNESSES IN VENTOR,

. By W 47 ATTORNEY.

R. A. FBSSENDEN/ WIRELESS TBLEGRAPHY APPLIUATION FILED FEBJB, 1909. 1, l 32, 569 Patented Mar. 23, 1 915.

3 SHEETSBHEET 3.

fiww 4 WITNESSES: IN VENTOR Q Q; ATTORNEY.

UNITED STATES PATENT OFFICE REGINALD A. FESSENDEN, OF BRANT ROCK, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO SAMUEL M. KINTNER, OF PITTSBURGH, PENNSYLVANIA, AND HALSEY M. BARRETT, 0F BLOOMFIELD, NEW JERSEY, RECEIVERS.

WIRELESS TELEGRAPHY.

Application filed February 18, 1909. Serial .No. 478,593.

To all whom it may-concern:

Be it known that I, REGINALD A. FEssEN- DEN, a citizen of the-United States, residing at Brant Rock, in the State of Massachusetts, have invented certain new and useful Improvements in Wireless Telegraphy, of which the following is aspecification. My invention relates especially to means for increasing efficiency of apparatus for the transmission and receipt of energy by' electromagnetic waves, being especially concerned with improving the antenna; its principal object being to increase the efliciency by obtaining greater efliciency of radiation.

Other advantages will hereinafter appear.

I have illustrated the invention in two simple forms in the accompanying drawings, wherein- Figure 1 is a diagram representing the invention. in side elevation and Fig. 2 is a plan of the same. Fig. 3 represents a side elevation of a modified form.

To more clearly point out theexact nature I of the invention, it is necessary to refer somewhat to the history of antennae. The fact that the elevated antenna of Loomis, Dolbear and Edison, was capable of transmitting signals generated by high frequency oscillations over intervening obstacles was explained by Preece, (The Electrician for June 11, 1897), as due to electrostatic effects,

andby Marconi, (British Patent No. 12039 .of 1896), as transmission through the earth or water; by Blondel as electrostatic surges in a conductor, the antenna forming the two terminals and the earth between them a connecting conductor and by Taylor as current,

1 wave traveling over the surface of the earth,

the lower half of the wave being absent and replaced by its image (Am. Institute a; Eleczm'c Eotgjneerafor November, 1899 By means. of this theory the applicant was enabled to devise a number of improvements in antennae. But the exact method in which the waves are radiated fromsuch antennae has not been heretofore amenable'to calculation.

The applicant has discovered that the radiation efliciency of an antenna with respect to the power used depends upon the Specification of Letters Patent. I

dynamo shown, and 14:, 14, are tuning in- Patented Mar. 23, 1915.

tenna produces no effect on the radiation, 0

butmay be used to increase the capacity. This is probably the reason for the efliciency of the horizontal type of antenna. In these antennae, however, the capacity of the antennae to ground depends upon thecapacity 5 of the horizontal portion with respect to ground, and as the horizontal portion is at some distance above the ground this capacity is necessarily limited,

In some cases the capacity of the antennae 7 has been increased by the presence ofother conductors, but these conductors not being ;tangential have neutralized the radiation from the main antenna,.and so produced a detrimental effect rather than abeneficial one.

Applicant has discovered that by arrang- 2 ing other conductors so that they are grounded, either directly by Wire, or indirectly through a capacity, in proximity to the horizontally 'or "tangentially arranged conductors forming the top of'the antenna, and arranging said grounded conductors so that they lie on the whole tangentially to the direction of the. emitted waves, very highly efiicient antennae, of large radiating capacity, are produced.

In Figs. 1 and 2, 11 represents a central mast which may be built of insulating material, and 12, 12,12 are similar shorter masts around the circumference of a circle of Which 11 is the center.' 13 represents a gen erator of high frequency oscillations, such as the high frequency alternating current ductances in circuit therewith. The top of the antenna is formed by conductors 15,15,

which are connected to the dynamo 13 as by the lead 16, and supported on the. mast 11 by insulated support 17, and on masts 12 100 fastened to the top of mast 11 at 1'7 by 105 ropes 24, and also to the insul'ated supports- 19, 20, and to the bottom ofmast 11 by insulated support 18. The conductors 23.

being in proximity to the conductors 15, and the latter having large capacity relative to the other terminal of the dynamo 13, the

' the lower terminal from the dynamo 13 is connected to ground, and the conductors 23, are also grounded, conductors 15 being mounted as before.

Having thusdescribed my invention andillustrated its use, what I claim as new and desire to secure by Letters Patent, is the following:

1. In apparatus for signaling by electromagnetic waves an antenna having an extended upper portion and grounded conductors in proximity to said extended portion arranged in direction so as to increase the capacity of said upper portion, substantially as described.

2. Anantenna for wireless signaling comprising an extended radiating or receiving set of conductors and a set of grounded conductors arranged to increase the capacity of said radiating receiving portion, substantially as described.

-3. An antenna comprising an extended multiple wire upper portion combined with supplementary conductors in close proximity to same and arranged to increase the capacity of the upper portions.

4:. An antenna comprising a set of radially arranged conductors 'of large capacity, and

a supplementary set of radially arranged grounded conductors adapted to increase the capacity of the'first set, substantially as described.

5. The combination with an antenna of "means for increasing its radiation efiiciency support, and auxiliary conductors adapted to increase the radiating efliciency of the antenna, substantially as described.

7 An aerial conductor system for wireless telegraphy, comprising a central support and a tent-shaped group of wires made up of a plurality of sections, each section beingindividually held by said support at one end and stretched obliquely toward the ground: atthe other. end.

'8. An aerial conductor system for wireless telegraphy, comprising a central support and a tent shaped group of wires consisting of a plurality of sections, each section being individually attached at one end to said support and attached to guys connected to the ground at the other end, and insulated both from the support and from the ground, substantially as described.

In testimony whereof I have hereunder signed my name in the presence of the two subscribed witnesses.

REGINALD A. FESSENDEN. Witnesses:

JEssm ETTA BENT,

FLORENCE MAY LYON. 

